diff --git a/src/vs/platform/theme/common/tokenClassificationRegistry.ts b/src/vs/platform/theme/common/tokenClassificationRegistry.ts
index e8bbd9403be5b..ab705dbcab32e 100644
--- a/src/vs/platform/theme/common/tokenClassificationRegistry.ts
+++ b/src/vs/platform/theme/common/tokenClassificationRegistry.ts
@@ -312,8 +312,8 @@ class TokenClassificationRegistry implements ITokenClassificationRegistry {
 	};
 
 	constructor() {
-		this.tokenTypeById = {};
-		this.tokenModifierById = {};
+		this.tokenTypeById = Object.create(null);
+		this.tokenModifierById = Object.create(null);
 		this.typeHierarchy = Object.create(null);
 	}